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759 

WWUS20 KWNS 162014

SEL8

SPC WW 162014

ARZ000-KSZ000-MOZ000-OKZ000-170300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 588

NWS STORM PREDICTION CENTER NORMAN OK

315 PM CDT THU JUL 16 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST ARKANSAS

       EXTREME SOUTHEAST KANSAS

       SOUTHWEST AND SOUTH CENTRAL MISSOURI

       NORTHEAST OKLAHOMA



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 315 PM UNTIL

1000 PM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST

SOUTHWEST OF TULSA OKLAHOMA TO 25 MILES EAST SOUTHEAST OF FORT

LEONARD WOOD MISSOURI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 587...



DISCUSSION...STORMS ARE CONTINUING TO DEVELOP AND INTENSIFY ALONG

BOUNDARY EXTENDING FROM CENTRAL MO INTO FAR NRN OK.  THE AIR MASS

HAS RECOVERED FROM MORNING CONVECTION WITH A WELL-DEFINED LOW LEVEL

THERMAL/INSTABILITY AXIS NEAR THE BOUNDARY...WITH MLCAPE OF

1500-2000 J/KG.  APPARENT SHORT WAVE TROUGH MOVING SEWD INTO THE

LOWER MO VALLEY REGION AND ATTENDANT 35-45 KT WNWLY MID LEVEL WINDS

ARE EXPECTED TO ENHANCE CONVECTIVE ORGANIZATION WITH POTENTIAL FOR A

FEW SEVERE STORMS THROUGH THE EVENING.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 28030.





...WEISS

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